I tend to agree with this amendment proposal, even though I find that clause 20 tempers matters by stating the following:
20. This Act is to be construed and applied in a manner that is reasonable in the circumstances, and in a manner that is not likely to (a)... (i) by causing interference...compromising or hindering the investigation of any offence...
This may be a smokescreen, but there's no harm in being extra careful. So it's not a bad idea to specify that again. This should not extend to information from investigation files that are still active.